A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.
NSN 5999-01-414-6388
NSN 6150-00-518-4558
NSN 6610-01-184-9700
NSN 7035-01-348-5153
NSN 7035-01-260-0804
NSN 5999-01-432-2147
NSN 5925-01-185-1390
NSN 6240-01-285-7616
NSN 5935-01-589-6844
NSN 5985-01-145-3402
NSN 5925-01-313-3895
NSN 5965-00-549-0220